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Pioquinto García, Sandra; Garza Rodríguez, Luis Ángel; Bustos Martínez, Diana; Cerino Córdova, Felipe de Jesús; Soto Regalado, Eduardo; Giraudet, Sylvain; Dávila Guzmán, Nancy Elizabeth
Journal of cleaner production, 03/2021, Letnik: 286Journal Article
The potential use of raw and expanded perlite as low-cost adsorbents for biogas purification has been investigated. The thermal expansion of perlite causes a reduction in the density of silanol groups from 2515.43 to 653.75 OH/nm2; in contrast, the specific surface area of perlite increased two-fold due to the thermal expansion. To determine the equilibrium adsorption capacity and the adsorption kinetics batch experiments were conducted. The adsorption capacities are in the following order: activated carbon (6.8 mg/g) > silica gel (6.6 mg/g) > expanded perlite (5.8 mg/g) > raw perlite (5.6 mg/g) when compared at the same experimental conditions. The equilibrium adsorption data showed that perlite can be used to reduce the octamethylcyclotetrasiloxane concentration below 28 mg/m3, as recommended by leading manufacturers. The adsorption kinetics of octamethylcyclotetrasiloxane onto raw and expanded perlite followed the Linear-Driving Force model suggesting that the mass transfer is the rate-controlling step. In addition to its low cost, expanded perlite has the advantage of requiring lower desorption temperature (200 °C) for regeneration in comparison to the reported values for activated carbon (>400 °C) and fast desorption kinetics (20 min), which could contribute to a cleaner production of biogas. Display omitted •The density of silanol groups in perlite decrease 74% after thermal expansion.•Perlite has similar siloxane adsorption capacity than activated carbon and silica gel.•A long time is required for perlite to achieved adsorption equilibrium (170 h).•Perlite can reduce siloxane concentration to 28 mg/m3 as recommended by manufacturers.•Perlite showed fast desorption (20 min) and a low regeneration temperature (200 °C).
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